android:模拟水波效果的自己定义View

Github地址：https://github.com/nuptboyzhb/WaterWaveView

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1.先看效果

2.再看关键代码

描绘函数y = Asin(wx+d)+offset

/**
   * 使用路径描绘绘制的区域
   * 
   * @return
   */
  private Path getFristWavePath() {
    // 绘制区域1的路径
    if (firstWavePath == null) {
      firstWavePath = new Path();
    }
    firstWavePath.reset();
    firstWavePath.moveTo(0, height);// 移动到左下角的点
    for (float x = 0; x <= width; x += X_STEP) {
      float y = (float) (waveHeight * Math.sin(omega * x + moveWave) + waveHeight)
          + heightOffset;
      firstWavePath.lineTo(x, y);
    }
    firstWavePath.lineTo(width, 0);
    firstWavePath.lineTo(width, height);
    return firstWavePath;
  }